body{
    margin: 0px;
    padding: 0px;
    font-family: '微软雅黑';
    font-size: 14px;
    box-sizing: border-box;
}
header{
    width: 100%;
    min-width: 1200px;
}
.header{
    width: 1200px;
    height: 80px;;
    margin:  0 auto;
}
.flex{
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    float: right;
}
.nav {
    width: 524px;
    height: 80px;
}
.nav li{
    list-style: none;
    float: left;
}
.nav li a{
    padding: 15px;
    font-size: 16px;
    cursor: pointer;
}
.nav li a:hover{
    color: #428bca;
}
a{
    text-decoration: none;
    color: #000;
}